installing dbd-pg for existing postgres 8.1 server

Hi!
Please i have problems installing this driver. any help?

i have an already installed postresql 8.1 database server on my laptop.
i have installed the following prerequisites
postgresql 8.1
activestate perl 5.8 build 820
DBI module from cpan
nmake from visual C++

I wish to use perl scripts to access my postgres databases, but i have 
problems with  installing the DBD-Pg driver.

Does someone know how to do it cleanly on an existing database. on a 
windows platform?

Thanks
george